Controller for electric motors.



R. L. MUNSON.

CONTROLLER FOR ELEGTRIG MOTORS.

APPLIOATION' FILED FEB.11,1908.

91 2,871 a Patented Feb. 16, 1909 3 SHEETS-SHEET 1 INVENTOH ROBERT L.Mumsow R. L. MUNSON.

CONTROLLER FOR ELECTRIC MOTORS.

. APPLICATION FILED FEB. 11,1908. 912,871

Patented Feb. 1 1 909.

3 SHEETS-SHEET 2.

W/TNESSES QAWW. W

ATTORNEYS INVENTOI? B. L. MUNSON. CONTROLLER FOR ELECTRIC MOTORS.APPLIOAIION FILED PEB.1'1, 1908.

' 91 2,87 1 Patented Feb. 16, 1909.

3 SHEETS-SHEET 3;

5 ,0 LINE FIELD nRmrvruRE WITNESSES INVENTOR fiosenr L. Muuson, v

@ 05 I W ATTORNEYS To all'iuhom it mcy concern: ,{Be it known that I,Rounn'r Lnoxnms -Muuson, a citizen of the United States, and I aresidentof Seattle, in the'county ofKing and State of \Vashington, have madecertain new and useful Improvements in Controllers or Electric Motors,of which the following specification. V My invention is in the nature ofan imm proyed coritroller forv electric motors and 3y; specially of thatform of controller of co1nmpaet ,limits-andportable character known asstarting-boxes, the same being also capable l use as. phase splitters.

One object of my invention. is to provide arti ng box which can be madeeither dust 3 proof or of ventilated pattern in which easy ccess may behad to the resistance coils for 6 conveniently inspecting, repairing orreplac- 2. 32 11% t m 'A further object is to have a box so conructedthat the coils can be wound on cores c w-ith contact ends on. the coresso that they can be removed and replaced at will without 2-5-'"disturbing the rest of the box and in which ebox is provided with spring clips,sockets or clamps in which the coils may be de- ,tachably seated andremoved and replaced, the same as a no-arc fuse, in case the coils 4 3nareburned out, without having to loosen any so ofrt-he connections.

To these ends my invention consists in the it novel construction andarrangement of the .e'itboxfand-its associated parts as willbe herev'itainafter fully described. with reference to the n; drawing in.which-Figure 1 is atop plan view of the starting box or controller. Fig. 2 isa top plan view with the box opened andone of the coils removed.- Fig. 2is a detail partly in section of one of the resistance coils. Fig. 3 isa sectional end View of'thebox open. Fig. 4% is a'perspectivodetail ofthe holding magnet thecontrol-ler arm. Fig. 5 isa diagram 9 illustratingthe circuit connections of the coils and contacts, and Fig. 6 is an end'view of a modified form of starting box adapted to receive a largenumber of resistance coils. Referring to Figs. 2 and 3 it will be seenthat the 'box resembles the old boxes now in use in its outsideappearance, but is made in the lowrpart at the points m, so that saidppcrpa'rt may be turned back upon said Specification of Letters'latent.I

two parts, the upper part B being hinged to 5' hingesto expose theinterior of the box. The

nnnormc Morons.

Patented Feb. 16, race.

Application filed. February 11, 1908. Serial Nr415,299.

upper part 13 consists of a slate surface connected to a marginalmetallic frame B which carries the hinges and the slate surface as seenin Fig. 1 has the usual controller handle G with curved insulated seriesof contact points RT, P P P P holding magnet H for the controller handleand binding posts L, F A, for the connecting wires lead: ingrespectively to the line, field magnets, and armature. v 'lzheboijtom'part of the box may bemade solid wit the sides or it may be madeopen and provided with flanges 0 to which is fitted, as shown in Fig: 3,a detachable bottoln plate 0. (This plate C serves to close in thebottom part of the box and to render the same dust-proof. Y

The top portion ofthe box is formed with a rabbet'around the edge of thesame, leaving a flange 1) along its inner edge which when the cover isturned down enters the interior of the box for the purpose of making atight joint to render the box dust-proof and fire'proof in case thecoils should burn out. The. two portions of the box which arehingedtogether-at w are secured in closed position. by means ofeatchesor two screws 8 s, as seen in Fig. 1, thus holding the joints of the boxclose and making a neat dustand fireproof box. If it is desired to makeyentilated boxes, they are formed with holes or slots in the sidesthereof in. the ordinary way.

The box is'provided with any number of detachable resistance coils D. Insome cases the hinged cover of the'box as shown on the right of Figs. 2and 3, in which case the box maybe made very shallow. In other cases thebox will be made with resistance coils of the boxas seen in Figs. 2 and3, while for very large motors there may be one or more central hingedframes arranged in the middle of the box, as seen in Fig. 6, in whichbase portion of the box and B thefintermediate frame, which partsformhorizontal "are hinged together at the points :11 andw so to beturned. up as shown in dotted lines toexpos'e the coils. On the -intermethere may be twosets ofcoilswhich'may these. resistance coils will beplaced only inattached both to the cover and located inside B representsthe hinged top cover, B thesectio ns of the box of equal cross sectionandv diate frame B there may be placed eitheuone set of coils as shownin dotted lines-or UM E @FFICE- I 4 1 ROBERT LEONIDAS MUNSON, orSEATTLE,"WASHINGTON.

- lines, the attractive influence of the pole pieces It It upon thecontroller arin- G will exposed onboth sides by turning said section onits hinges :2 In the top of the box, as seen in Fig. 3, there isarranged on opposite sides, non conducting stri s B ofslate or otherinsulating materia which are screwed to the. flange b of the marginalframe. In like manner slate strips C are secured within the box upon thefian e 0 and these slate strips have metallic plates E screwed to thesame, which plates also carry any suitable number of socket spring clipse e into which are detachably inserted the resistance coils D. Theconnections betweenthese spring clips are made by means of the brassstrips E, upon which they rest, the spring clips being arranged in suchgroups on the plates E as to permit'the current to pass-through theresistance coils in any de-' sired manner. 'As shown in the diagram.

Fig. 5, my box is arranged to be connected up in parallel, or in otherwords, the current is passed throu h two coils at a time and thereforefor eac point of advance for the controller arm G, two coils are cut outuntil all of the resistance of the box .is cut out of the circuit Thecontroller arm G, see Fig. 1, is provided with a spiral spring 1;, oneend of which is connected to the controller arm and the other to astationary post of the box, so that its tension will normally hold. thecontroller arm G against the insulation stop 9.

When, however, thepontroller arm is moved by means of its handle overthe contacts P P it may be stopped upon any one of said contacts and forthis purpose the con:- troller arm formed wi-tlvthe segmental notchplate 1 into'thc notches oi. which a This electro-magnet has its polaraxis parallel to the radial line of the controller arm when thrown toits extreme position. a The upper portions of the pole piece extensionsh /L are carried beyond the I-'ange;;of tl1e armature Iv seenin Fig. 4for the' purpose of alinement with the edge of the iron arm G of thecontroller, so that when the controller arm G isthrown to its extremeposition to the left of Fig. '1, as shown in dotted hold it in saidposition. This is done to allow the box to .be used as a starting box incase the spring on the armature. becomesbroken or fails to hold in thenotches and in this way the motoris prevented from being at out ofcommission; \Vhen the controller 1S used as a starting box the springpawl-and the notches may be omitted and the ma net only will be used, inwhich case the ham led arm must not be released until it rests againstthe magnet. poles to be retained thereby. The spring V that turns thecon troller handle back to its offjapoint is a spiral spring andone-endis put in a hole that has been drilled in the post 1i) and theother end is hooked behind the handle bar in such a way that as soon asthe ma net releases the handle bar the sprin wil return the handle barto the otf position. The post an upon which the handle bar turns, has ahole at the top through which a cotter pin n is passed to hold thehandle on. Under the handle arm G there is placed the Yusual bearingspringof metal for making contact with the contact oints PP.

The general type of oxes will for the most part have three binding postson them as shown at L, F, A, in Fig. 1, for line, field and armaturerespectively, although some boxes will have moreor less according to thepurpose for which they are intended.

Thus-for instance, in the case of a phase splitter, there would be fewercontact .points and more binding posts. 'It also depends upon the numberoi resistance coils and how they are connected up and as to how manycontact oints there will be on the box. If desire the top from any oldbox can be used in connection with my in-v vention.

1 The connections are made from the under side of the slate top fromeach contact point to a screw on the end of a lug which is fastened tothe spring clamp or its base plate.

The resistance coils, see Fig. 2, are

formed of tubes of asbestos d, woundwith wire d having at the endsthereoflmetallic collars d (i which are res eetivelyconnected to theopposite endso the wire coil (l whose convolutions are insulated fromeach other. When one of these resistance i coils is placed within thesocket 011 s e e at each end of the box the current cm the socket clips6 c at'one end coming in contact with the collars (l of the resistancecoil, pass thence through the wire coild'to the collar d at the o positeend and thence to the socket clip an its base plate at this other end.The metallic collar at the ends of the resistance coils form permanentconnections with the wire coi1s,.which .are not liable to becomedisconnected b any expansion and rotary movement" of. t 1e wire whenheated and these collars are made as'wide cylin-- drical bands extendingaconsiderable distance along the resistance. unit with. perfectly.

smooth external peripheries forming substantial friction bearin venientlthrust lateral y in between and removed rom the spring clips. The hollowends of the asbestos cores, being wholly unobstructed, form seats intowhich a hook that may be conmay be insertedbetween the springfclips soare very close to the side walls of the box.

burned out as inthe old box and itwdoes not take an expert to repairthem, the box I can behad,

1 and 2;

i Wnagnet ll, to the field. Wlwn the handle is next'advanced to .the'contact l";

the old coil and replacing it with anew one 3 mounted 111 sainaneasyand'convenicnt inanrn-r. it there happens to he no extra coilson hand, one or 7 more of the coils at the beginning of the series maybe vremoved and be placed in the sockets of the burned out (.()ll.-..thus allowlng-the motor to be operated until more coils stated theresistance coils in my controller. box are arranged "as shown in Fig. 5in parallel, that is to-say, the current passes sin'iultancously throughtlietwo coils thence through 3 and l; thence through 5 and t), thencethrough 7 and is As before i v and thence through 5) and 10. As shown inthis diagram the controller arm (1' in the oflv position. When advancedto the con tact P, the current from the line pa through wire 7/, to thecontroller arm and v ,thence divides going through all the resistance00113 as follows. Fro n the contact I, WlIe' p, clamp plate I), pair ofcoils 9, 1t),

and thencesuccessively through pairs 7 8, 5,-6, 34e and 1-2, the wire7), contact P, wire 27 to the arn'iaturc. The line current from thecontroller handle also passes through thewire 7/ and and theelectrocontroller the armature current follows the same path except thatthe lefilflttll'lCti coils t) and 10 are cutout; when the controllerhandle is advanced to the contact pointl, coils 7 and 8 are cut out;when it advances to the contact point P coilsv5 and 6 are cut out; when,it advances to the contact point 1" coils 94 are cut out; and when itadvances to the I 1 and 2 are cut out, stance of the 5 5 and contactpoint P the coils which cuts out the entire re:

boX, and the cu rent then flows from line to 1 i l l l 1 l l i i l thecontroller handle through the wire 17 and thence through controller armto the contact P and thence directly to the armaf ture through wire p.By this construction the connections are not disturbed when. theconnections are I claim 1. A controller box having a hinged cover andprovided with parallel series of spring socket clips, one series ofclips being carried by said cover, and detachable resistance coils idsocket clips parallel to the hinged cover and arranged to be exposed byturning back the cover. v

A controller box having ahinged cover and provided in both the body ofthe box, and on its cover with two parallel series of spring socketclips, and detachable resistance coils mounted in said socket clipsinparallel position to the cover and the bottom of the box, and arrangedto be exposed by turning back the cover.

5. A controller box having a hinged cover provided with socket clips anddetachable resistance coils mounted in said socket clips arranget l tobe exposed by turning back the cover, and a body portion having socketclips with detachable coils arranged therein,

cover and the other being disposed in the body of the box, an insulatingsupport for said clips and detachable coils arranged with conductingcollars at the end of broad cylindrical peripheries adapted to. beforced between and held in contact with the clips.

An electric resistance box consisting of a plurality of equal crosssections hinged together, each section being provided with socket clipsand detachable resistance coils arranged to be exposed by the turning ofthe sections hack on their hinges.

ROBERT LllONlDAS Mt'xsox.

\l'itnesscs: v

' Romxn M. VALLET, FRANK A. RoeLL.

